Openmoko Bug #2229: GSM was working fine for months, suddenly will not register using any GSM stack

[Openmoko Public Trac]

#2229: GSM was working fine for months, suddenly will not register using any GSM
stack
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 Reporter:  danek2    |          Owner:  hardware                  
     Type:  defect    |         Status:  new                       
 Priority:  normal    |      Milestone:                            
Component:  hardware  |        Version:  GTA02v5                   
 Severity:  normal    |       Keywords:  calypso, gsm, registration
 Haspatch:  0         |      Blockedby:                            
Estimated:            |    Patchreview:                            
 Blocking:            |   Reproducible:  always                    
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Comment(by joerg):

 reset on registering clearly looks like a weak worn battery (or dirty
 contacts) so voltage drops below the magic 3.5V due to high source-
 impedance when modem starts to draw current for TX-activity.
 Please try a spare bat, or probe actual voltage of bat at connectors with
 a scope (~0.5s/div) during registering.

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2229#comment:3>
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